NXdataWidget axis selector improvements

Follow-up of #4427 

- [ ] Fix alignment of axis label (https://github.com/silx-kit/silx/pull/4459)
- [ ] [Remove/deprecate `customAxes`](https://github.com/silx-kit/silx/pull/4427#discussion_r2372674307) (https://github.com/silx-kit/silx/pull/4462)
- [ ] Implement axis labels for other `Array...Plot` widgets